I understand this is an old post but since nothing had been marked as an answer I thought I'd add a suggestion.
We have 7942 and 7945 phones in our environment and CS510's with the APC-41 hookswitch.
For us it's a problem in the ordering of the cabling to the headset base station. When the hookswitch cable is plugged in to the base station before the power cable is plugged in, call control from the headset does not work correctly. This is what we do to make sure call control works (after making the config changes as you mentioned in either CME or CUCM):
- connect the power to the headset base station
- connect the APC-41 hookswitch cable to the base station.
So if everything else is configured correctly as you have mentioned, it could be the order of the cables being plugged in.
I realize this is a very old post but wanted to add that the order of plugging in the cables worked for me. Thanks James. I have hookswitch APC-43 on a Cisco 7962 and plugging in the power first to a Platronics headset and then waiting a few seconds before plugging in the hookswitch resolved the issue. The headset answers and disconnects a phone call.
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